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https://issues.apache.org/jira/browse/FLINK-20158?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17237242#comment-17237242
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Robert Metzger commented on FLINK-20158:
----------------------------------------
Resolved on master in
https://github.com/apache/flink/commit/ea6d42be514df9956c36ba8713897117eec0de67.
> KafkaSource does not implement ResultTypeQueryable
> --------------------------------------------------
>
> Key: FLINK-20158
> URL: https://issues.apache.org/jira/browse/FLINK-20158
> Project: Flink
> Issue Type: Bug
> Components: Connectors / Kafka
> Affects Versions: 1.12.0
> Reporter: Robert Metzger
> Assignee: Egor Ilchenko
> Priority: Critical
> Labels: pull-request-available
> Fix For: 1.12.0
>
>
> As a user of the new Kafka Source introduced in (FLINK-18323), I always have
> to specify the return type:
> {code}
> DataStream<Event> events = env.fromSource(source,
> WatermarkStrategy.noWatermarks(),
> "Kafka
> Source").returns(TypeInformation.of(Event.class));
> {code}
> The old Kafka source implementation implements {{ResultTypeQueryable}}, which
> allows the DataStream API to get the return type from the deserializer.
> The new Kafka Source also should have access to the produced type from the
> deserializer to forward it.
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